Pumping unit



cs. A. WAHLMARK 2,309,683

PUMPING UNIT Filed Oct. 25, 1940 Feb. 2, 1 943.

2 Sheets-Sheet l If W7 55 5277?? as Feb. 2, 1943. s, A. WAHLMARK I2,309,533

PUMPING UNIT Filed Oct. 25, 1940 2 Sheets-Sheet 2 Patented Feb. 2 1943UNITED STATES PATENT OFFICE PUMPING UNIT Gunnar A. Wahlmark, Rockford.Ill.

Application October 25, 1940, Serial No. 362,814

15 Claims. (Cl. 10342)' The invention relates generally to a pumpingunit and more particularly to a unitary structure composed of motor,pump and control valve articularly adapted for supplying fuel oil to oilburners.

One object of the invention is to provide a pumping unit having fewerparts than prior units, thereby to render the unit more economical ofmanufacture.

Another object is to provide a pumping unit which is extremely compactand, in particular, has a minimum overall dimension measured parallelwith the motor and pump shafts.

Another object is to provide a new and improved pumping unit especiallysuited to domestic oil burner applications in that it can readily beserviced in the field.

Another object is to provide a new and improved pumping unit designed topermit ready removal of the pump mechanism for inspection orreplacement, without loosening or disconnection of conduits and whilethe pump shaft remains in place. and the mechanical seal on the shaftunbroken.

Another object is to provide a pump of the gear type having' a removableclosure with fluid passages formed in the closure and the pumpingelements mounted to be removed with the removal of the closure.

Still another object is to provide a pumping unit composed of a motorand a pump of the gear type in which an outboard bearing is provided forthe pump driving shaft in a removable member on which is mounted thepump driven by the shaft.

Yet another object is to provide a pumping unit composed of a motor, apump of the gear type and a control valve, the pump and valve beingconstructed as a unit for attachment to 'or detachment from the motorand for coupling or uncouplingof the pump and motor shafts by simpleaxial movement.

It is a further object to provide a pumping unit composed of a motor,apump of the gear type and a control valve in which one bell of themotor housing has formed integral therewith the valve housing and themajor part of the pump housing, and in which the motor shaft extends toform the pump shaft.

Other objects and advantages will become apparent from the followingdetailed description taken in connection with the accompanying drawings,in which:

Fig. 1 is a view partially in diametrical section and partially inelevation of one form of pumping unit embodying the features of theinvention.

Fig. 2 is a transverse sectional view taken ap proximately along theline 2-2 of Fig. 1.

Fig. 3 is a partial transverse sectional view taken approximately alongthe line 3-3 of Fig. 1.

Fig. 4 is a transverse sectional view taken approximately along the line4-4 of Fig. 1 and looking in the direction indicated by the arrows.

Fig. 5 is a sectional view taken approximately along the line 5-5 ofFig. 4.

Fig. 6 is a sectional view similar to Fig. 5 but taken along the line6-6 of Fig. 4.

Fig. 7 is a view similar to Fig. 1 but of a modified form of invention.

While the invention is herein disclosed in a preferred form and onemodification thereof, it is not intended that the invention is to belimited thereby to the specific constructions disclosed. 011 thecontrary, it is intended to cover all modifications and alternativeconstructions falling within the spirit and scope of the inven-' tion asdefined in the appended claims.

In the forms shown for purposes of disclosure, the pumping unitcomprises generally a motor 10, a pump device or means II, and. adischarge control valve mechanism l2. The motor I0 is preferably anelectric motor of generally conventional construction having a casing l3which includes an end closure or bell it having a bushing l5 to providea bearing for the motor shaft l6. For a purpose which will later becomeapparent, the bell I4 has formed externally thereof a heavy axiallyextending annular flange l1 forming a recess l8. Also for a purposewhich will later become more apparent the shaft [8 terminates flush withor short of the bottom of the recess l8 and has opening through the endthereof a socket l9 which is squared or formed in some other angularshape to enable the same to serve as one part of a driving coupling.

The pump H and the discharge control valve mechanism l2 are of thegeneral type disclosed in my copending application for Fluid pumps,Serial No. 212,475, filed June 8, 1938, but improved, among otherrespects, to permit the pump and the valve mechanism to be readilyattached to or detached from the motor Ill as a unit, so that whenattached a complete pumping unit is formed. Accordingly, the pump andthe valve mechanism are enclosed in a housing composed of two parts 2|and 22. Part 2| of the housing constitutes a main casing memher and isgenerally cup-shaped to provide within it a fuel intake chamber 23,while part 22 is in the form of an end closure or cap removably securedover the open end of the member 2| through the medium of bolts 24. Thepart 2|, as best seen in Fig. 2, is generally cylindri- Y cal, but has3. depending portion 25 which has ception of the discharge control valvemecha-' nism l2. It is contemplated that the main casing member 2| willhave intake ports 21, a discharge port 28, and a return or by-pass port29. It is to be understood that these ports will be suitably threadedfor the reception of conduits by which the pumping unit is connected tothe fuel supply tank and to the fuel burner. It will be seen thereforethat the pump device and the discharge control valve mechanism arehoused in a common housing and form a subunit of the pumping unit.

The closed end of the main casing member 2| has an inwardly extendingannular flange 3| forming a bearing in which is rotatably journaled adrive shaft 32 for the pump device I At one end this shaft 32 extendsoutwardly of the main casing member 2| and has its projecting endsquared or otherwise angularly shaped to conform with the shaping of thesocket l9 so that it may be received axially within the socket l9 andform a driving coupling between the shaft 32 and the shaft l6. Extendingoutwardly from the closed end of the main casing -member 2| is a heavyannular boss 33 of an outer diameter just slightly smaller than theinner diameter of the annular flange H. The boss 33 may thus be receivedwithin the recess IS in the same axial movement that couples the shaft32 and the shaft It. To retain the boss in the recess, there extendradially of the flange I! a plurality of set screws 34 which engage withnotches 35 formed in the outer periphery of the boss 33. Leakage offluid along the shaft 32 is prevented by a rotary mechanical seal 36enclosed Within the boss 33.. The seal is more particularly shown andclaimed in my Patent No. 2,216,218, dated October 1, 1940.

The pump device II is of the rotary element type with the pumpingelements composed of an inner gear 40, an outer internally toothed gear4| which is mounted eccentrically with respect to the gear 40, and acrescent-shaped guard 42. The inner gear 40 constitutes the drivingelement and to that end is splined to cooperate with splines 43 formedon the inner end of the shaft 32, the gear thus being held againstrotation relative to the shaft but being shiftable axially of the shaft.To reduce the number of parts needed, but primarily to make possibleeasy and convenient removal of the entire pump device I I for inspectionor repair without disturbing the pipe connections to the main casingmember 2|, the elements defining the pump chamber in which the pumpingelements operate are mounted upon the end closure 22 with the endclosure itself forming one end wall of the pump chamber. The oppositeend wall is formed by a circular plate 44 which is spaced from the innerface of the end closure 22 by means of an annular ring 45. The circularplate 44 and the annular ring 45 are secured to the end closure by aplurality of bolts 46. Also carried by the end closure 22 is a straineror screen 41 through which the fuel in the intake chamber 23 must passbefore going to the pump device Herein this strainer is shown as annularand is mounted with a tight fit over the ring 45 and the circular plate44. In order further to secure the strainer, pegs or dowels 46 extendinginto the end closure 22 may be provided. With the above constructionthepump device may be removed as a unit with the closure 22 withoutdisturbing the pipe connections and without; disturbing the mechanicalseal 36. r V

In addition to forming one end wall of the pump chamber and a supportfor the pump device asa whole, the end closure 22 also serves to providean outboardrbearing for the shaft 32 and passages for the supply ordischarge of fluid to and from the pump chamber. Accordingly, theclosure 22 is formedwlth a recess 50 in which the splined end of theshaft 32 is received and journaled, the shaft being purposely made of alength to extend completely through the pump chamber and into the endclosure 22.

Suitable ports and passages are provided in order that the pump device II may draw fluid from the intake chamber 23 and discharge the same underpressure to the discharge control valve mechanism l2 from where it iseither discharged through the discharge port 28 or all or a portionby-passed either by direct return to the source through the port 29 orby return to the intake chamber 23. An intake port 5| for the pumpdevice II is, as best seen in Figs. 1 and 3, formed in the inner face ofthe circular plate 44 and comprises a diverging and outwardly extendinggroove 52 approximately one thirty-second of an inch in depth. Thisgroove opens through the periphery of the plate 44 to the interior ofthe strainer 41. Supplementing the port 5| is a pocket 53 formed op-Dosite the port 5| in.the end closure 22 (see Fig. 4). A discharge port54 is, as best seen in Fig. 4, formed in the end closure 22 with asupplementary pocket 55 formed opposite it in the circular plate 44.Port 54 communicates with the bore 26 of the valve mechanism through ashort horizontal passage 56, a vertical passage 51 and second horizontalpassage 56:: formed in the end closure 22, and a diagonal passage 58(see Figs. 1 and 2) formed in the main casing member 2|.

Also formed in the end closure 22 is an auxiliary port 60 disposedopposite the crescent-shaped guard 42, in order further to fill thespaces between the teeth of the gears 40 and 4| and render operation ofthe pump more quiet. This port is also connected to the bore 26 of thevalve mechanism, but to a different part thereof,

through a diagonal passage 6| (see Figs. 4 and 5), a vertical passage 62and a horizontal passage 62a in the end closure 22, and a diagonalpassage 63 (see Fig. 2). The passages 51 and 62 are conveniently drilledfrom externally of the end closure 22, and the lower ends of thepassages then closed by plugs 51' and 62', respectively. The port 60also communicates with the intake chamber 23 through the medium of ashort passage 64 which opens at one end to end caps 68 and 88, one ofwhich has opening therethrough the discharge port 28, while the I oth ercarries an adjusting screw 10. Within the bore is asleeve ll, andslidable within that sleeve is a piston 12, the closed end of whichserves to control discharge through the port 28. Passage 58 opens to thebore 26 between cap 68 and the adjacent end of the sleeve ll, asbestseen in Fig. 2, while passage 63 opens to the bore 26 between the cap 69and the adjacent end of the sleeve II and hence is in communication withthe interior of the piston through the open end thereof. The fluid underpressure, which is supplied to'the bore 26 through the passage 58, actson the closed end of the piston and tends to shift the same for-'thepurpose of opening the port 28 against'the reaction of a compressionspring I3 bearing at one end against the adjusting screw 10 and at theother end against the head of the piston internally passed fiuidjmay bepermitted to flow through port 29 and return directly to the source,preferably port.29 is closed by a, suitable plug I5 causing theby-passed fluid to flow through the passage 63 into the intake chamber23.

In the modified form shown inFig. 7, there is disclosed an electricmotor I0, like the motor III, and having a shaft l6 and a casingincluding anend closure or bell vl4. Also disclosed is a housing for thepump device II and the valve mechanism l2 which is a two-part housing.One of the parts, namely, the end closure or cap 22' is identical withthe end closure of the first form. The other part, whichis hereindesignated 14, is generally similar to the part 2| in that it iscup-shaped and provides an intake chamber'23', but is dissimilar in thatit is formed as an integral part of the bell l4 and is devoid of theboss 33. In view of this modification, the shaft I6 is extended so as toform the driving shaft for the pumping device H, completely eliminatingthe shaft 32 of the first form. The casing part particularly theelimination of the necessity of machining the main casing member 2|internally. Mounting of the pump device ll together with the strainer,41 on the end closure and making the same removable with the endclosure, greatly facilitates inspection, repair or cleaning of the pumpunit, while at the same time this construction makes possible theprovision of an outboard bearing for the drive shaft for the pump deviceand thus improves operation and prolongs the life of the pumping unit.It is also to benoted that though the end closure 22 is employed toprovide certain ports'and passages, the entire pump device may beremoved either for repair or replacement without disturbing the externalconduit connections. In the form disclosed in Figs. 1 to 6, the completepump device and control valve unit is readily attached to or detachedfrom the driving motor in a most simple manner involving only relativeaxial movement between the motor and the unit housing, and thetightening or loosening of a few set screws.

I claim as my invention:

1. A pump of the rotary element type comprising a pump housing includinga main casing member forming an intake chamber and having an open endanda removable closure for the i open end of said main casing member,means carried by said end closure and forming therewith a pump chamber,rotary pump elements mounted in said pump chamber, a shaft for drivingsaid pump elements, a fluid intake port and a fluid discharge portleading to and from said pump chamber, and an auxiliary intake portformed in said end closure for supplying additional fluid to the pumpelements intermediate the intake and discharge ports.

2. A pump of the rotary element type comprising a main casing memberforming an intake 14 still has an axially and inwardly extending 4annular flange 3| forming a bearing for the shaft I6 and the end closure.22 is still formed with arecess 50' in which the splined end of theshaft I6 is received to form an outboard bearing therefor. In otherrespects the construction of Fig. 7 is identical with that of Figs. 1 to6, and, for purposes of more readily understanding, like parts have beengiven the same reference character plus a prime, even though such partshave not been specifically mentioned in the description of the form'ofpumping unit shown in Fig. 7.

It is believed apparent from 'the foregoing description that I haveperfected a pumping unit which has many advantages both from amanufacturing and from an installation service standpoint. My pumpingunit is extremely compact, particularly has it a minimum length in itsaxial dimension. Manufacturing cost is reduced by the elimination of theelement which heretofore formed one wall of the pump chamber, and whichis herein displaced by the end' closure 22, and by reduced number ofmachining operations,

chamber and having an open end and fluid intake and discharge portsadapted for the connection of external conduits thereto, a removableclosure for the open end of said main casing member, means forming apump chamber, rotary pump elements mounted in said pump chamber, a shaftfor driving said pump elements jour naled in and projecting through saidmain casing member, said shaft being splined at its inner end to permitmovement of the pump elements longitudinally thereof while having arotary driving engagement therewith, and a rotary seal for said shaft,said pump chamber forming means being mounted on said end closure forremoval as a unit therewith without disturbing the external conduitconnections to said main casing member or the seal for the shaft.

3. A pump of the rotary element type compris ing a pump housingincluding a main casing member having a cup-shaped recess thereinopening through one end thereof, a, fluid supply port communicatingdirectly with the recess and a discharge port, both ports being adaptedfor connection of external conduits of a fluid circult to make said maincasing member a substantially permanent part of the circuit, andremovable closure for the open end of said maiz: casing member, chamberforming means mounted on .the inner face of said closure to be disposedwithin said recess when the closure is in position and to be removablewith the closure as an incident thereto and without disturbing said maincasing member or its connections with the conduits, an intake and anexhaust port in said chamber forming means, passages in said removableclosure and in said main casing member operable when said closure is inposition to complete communication between said intake port and saidrecess, and between said exhaust port and said discharge port, rotarypump elements mounted within said chamber forming means and removablefrom within said recess simultaneously with said end closure and withsaid chamber forming means, a bearing formed in the closed end of saidmain casing member, and a shaft for driving said pump elements journaledin said bearing and projecting into said chamber forming means, saidshaft at its end projecting into] said chamber forming means havingsplines to permit movement of the pump elements longitudinally thereofwhile having a rotary driving engagement therewith.

4. A pump of the rotary element type comprising a normally stationarymain casing member having a cup-shaped recess, a fluid intake portcommunicating with said recess, and a fluid discharge port, both portsbeing adapted for the connection of external conduits thereto, aremovable closure for the open end of said main casing member, chamberforming means mounted on the inner face of said end closure to bedisposed within said recess when the closure is in position and to beremovable with the closure as an incident thereto and without disturbingsaid main casing member or said external conduits, rotary pump elementsmounted within said chamber forming means and removable from within saidrecess simultaneously with said end closure andrwith said chamberforming means, a bearing formed in the closed end of said main casingmember, and a shaft for driving said pump elements journaled in saidbearing and projecting into said chamber forming means, said shaft atits end projecting into said chamber forming means having splines topermit movement of the pump elements longitudinally thereof while havinga rotary driving engagement therewith.

5. A pump of the rotary element type comprising a pump housing includinga main casing member having a recess therein opening through one endthereof and ports for attachment to external conduits of a fluid circuitto make said main casing member a substantially permanent part of thecircuit and a removable closure for the open end of said main casingmember, chamber forming means mounted on the inner face of said endclosure to be disposed within said recess when the closure is inposition and to be removable with the closure as an incident thereto andwithout disturbing said main casing or its connection with the circuitconduits, passages in said removable closure and in said main casingmember registering when said closure is in position to completecommunication between said chamber forming means and said ports, rotarypump elements mounted within said chamber forming means and removablefrom within said recess simultaneously with said end closure and withsaid chamber forming means, and a shaft projecting within said chamberforming means and having a driving engagement with at least one of saidrotary pump elements for driving said pump elements.

6. A pump of the rotary element type comprising a pump housing includinga first casing member having formed therein a plurality of ports forattachment to external conduits of a fluid circuit to become asubstantially permanent part of the circuit and a second casing memberremovably secured to said first casing member, chamber forming meanscarried by said second casing member to be disposed within the housingformed when said members are assembled and to be removable with thesecond casing member as an incident to removal thereof and withoutdisturbing said first casing member or its connection to the conduits,passages in said second casing member and in said first casing memberregistering when said casing members are assembled to completecommunication between said chamber forming means and said ports, rotarypump elements mounted within said chamber forming means, a bearing insaid first casing member, a shaft journaled in said bearing andprojecting into said chamber forming means, said shaft at its endprojecting into said chamber forming means having splines to permitmovement of the pump elements longitudinally thereof while having arotary driving engagement therewith, and a rotary seal for said shaft.

7. A pump of the rotary element type comprising a pump housing includinga first casing member having formed therein a plurality of ports forattachment to external conduits of a fluid circuit to become asubstantially permanent part of the circuit and a second casing memberremovably secured to said first casing member, chamber forming meanscarried by said second casing member to be disposed within the housingformed when said members are assembled and to be removable with thesecond casing member as an incident to removal thereof and withoutdisturbing said first casing member or its connection to the conduits,passages in said second casing member and in said first casing, memberregistering when said casing members are assembled to completecommunication between said chamber forming means and said ports, rotarypump elementsmounted within said chamber forming means, a bearing insaid first casing member, a shaft journaled in said'bearing andprojecting outwardly of said housing at one end for connection to asource of power and at its other end projecting through said chamberforming means, said shaft at its end projecting through said chamberforming means having splines to permit movement of the pump elementslongitudinally thereof while having a rotary driving engagementtherewith, and a recess in the inner face of said second casing memberin which the splined end of said shaft is received to form an outboardbearing for said shaft when said second member is attached to said firstmember.

8. A pumping unit comprising a motor, a pump housing including a firstcasing memberhaving ports therein for attachment to external conduits ofa fluid circuit to make said first casing member a substantiallypermanent part of the circuit, and a second casing member removablyattached to said first casing member to complete the pump housing, apump device having rotary pump elements mounted on said second casingmember to be disposed within the pump housing when the members areassembled and to be removable as an incident to removal of said secondcasing member and without disturbing said first casingmember or itsconnections to the circuit conduits, a rotary shaft driven by said motorfor driving said pump device journaled in said first casing member andhaving a splined end projecting through said pump device for rotarydriving engagement with one of the pump elements while permitting axialmovement for removal of said second casing member and said pump deviceas a unit without disturbing said shaft or said first casing member, anda recess in the inner face of said second casing member in which thesplined end of said shaft is received to form an outboard bearing forsaid shaft when said second member is attached to said first member.

9. A pumping unit comprising a motor, a pump housing including a firstnormally stationary casing part having a cup-shaped recess and a secondcasing part in the form of an end closure removably attached to saidfirst casing part, a pump device having rotary .pump elements, mountedon the inner face of said second casing part removable as an incident toremoval of said second casing part and without disturbing said firstcasing part, a rotary shaft driven by said motor for driving said pumpdevice journalled in said first casing part and having a splined endprojecting through said pump device for rotary driving engagement withone of the pump elements while permitting axial movement for removal ofsaid second casing part and said i 10. A pumping unit comprising a pumphousing including a first casing member having ports formed therein forattachment to external conduits of a fluid circuit to make said firstcasing member a substantially permanent part of the circuit, and asecond casing member removably attached to said first casing member andwhen attached completing the pump housing, a pump device carried by saidsecond casing member to be disposed within the pump housing when themembers are asembled and to be removable with the second casing memberas an incident to removal thereof and without disturbing said firstcasing member or its connections with the circuit conduits, passages insaid second casing member and in said first casing member functioningwhen said members are assembled to complete communication between saidpump device and said ports, a motor for driving said pump device, acasing for said motor including a removable end bell, said pump housingbeing supported by said removable end bell, and a shaft driven by saidmotor projecting through said end bell and having a driving connectionwith said pump device disengageable by movement of said puinp deviceaxially of said shaft.

11. A pumping unit comprising a motor, a casing for the motor includinga removable end bell having a bearing centrally thereof, a pump housingincluding a first casing member integral with the removable end bell ofsaid motor casing and having ports formed therein for attachment toexternal conduits of a fluid circuit to make said first casing memberand said end bell substantially permanent parts of the circuit, and asecond casing member removably attached to said first casing member andcompleting the pump housing, a pump device mounted on said second casingmember to be enclosed within the pump housing when, the members areassembled and to be removable with said second casing member as anincident to removal thereof and without disturbing said first casingmember or its connections to the circuit conduits, passages in saidsecond-casing member or parts carried thereby and in said first casingmember functioning when said members are assembled to completecommunication between said pump device and said ports, and a shaftJournaled in the bearing in said first casing member and having drivenengagement with said motor and driving engagement with said pump devicedisengageable by movement of the pump device axially of the shaft as anincident to disengagement .of said second casing member from said firstcasing member.

12. A pumping unit comprising a motor, a casing for the motor includinga removable end bell having a bearing centrally thereof, a generallyannular axially extending flange integral with said end bell providing arecess forming a fluid intake chamber, an intake port opening throughsaid flange for direct communication with the chamber, a discharge port,both ports being adapted for attachment to external conduits of a fluidcircuit to make said first casing member and said end well substantiallypermanent parts of the circuit, a closure memberremovably attached overthe open end of said flange to complete with the flange a pump housing.a pump device mounted on the inner face of said end closure to beenclosed within the pump housing when the closure is in position and tobe removable with said closure as an incident to removal thereof andwithout disturbing said annular flange or its connections to the circuitconduits, an intake port for the pump device communicating with theintake chamber, an exhaust port for the pump device, passages in saidend closure and in said annular flange registering when the closure isin position to complete communication between the exhaust port of saidpump device and said discharge port, and a shaft driven by said motorprojecting through and journaled in the bearing in said end bell andhaving'a driving eng gement with said pump device disengageable bymovement of the pump device axially of the shaft as an incident todisengagement of said end closure from said annular flange and end bell.

13. A pumping unit comprising a pump housing including a first casingmember having ports formed therein for attachment to external conduitsof a fluid circuit to make said first casing member a substantiallypermanent part of the circuit,and a second casing member'removablyattached to said first casing member and when attached completing thepump housing, a pump device carried by said second casing member to bedisposed within the pump housing when the members are assembled and tobe removable with the second casing member as an incident to removalthereof and without disturbing said'first casing member or itsconnections with the circuit conduits, passages in'said second casingmember and in said first casing member functioning when said members areassembled to complete communication between said pump device and saidports, a motor for driving said pump device, a casing forsaid motorincluding an end bell, cooperating means on said end bell and on saidfirst casing member engageable to couple said 'motor and said pumphousing as a unit and to perincluding a first casing member having portsformed therein for attachment to external conduits of a fluid circuit tomake said first, Casing member a substantially permanent part of thecircuit, and a second casing member removably attached to said firstcasing member and when attached completing the pump housing, a pumpdevice carried by said second casing member to be disposed within thepump housing when the members are assembled and to be removable withthesecond casing member as an incident to-removal thereof and withoutdisturbing said first casing member or its connections with the circuit.conduits, passages in said second casing member and in said firstcasing member functioning when said withdrawal without disturbing saidfirst casing member or its connections with the circuit conduits, and ashaft driven by said motor projecting through said end bell and saidannular boss and having a driving connection with said pump devicedisengageable byzrelative movement of said pump device and said shaftaxially of said shaft.

15. A pumping unit comprising a pump housing including a first casingmember having a cupshaped recess therein opening through one endthereof, a bearing formed in the closed end of said member and ports forattachment to external conduits of a fluid circuit to make said firstcasing member a substantially permanent part of the circuit, an annularboss projecting axially outwardly from the closed end of said memberconcentrically with the bearing and a second casing member removablyattached to said first casing member to form an end closure therefor, a.pump device carried by said second casing member on its inner surface tobe disposed within the pump housing when said second casing member is inposition and to be removable with the second casing member as anincident to removal thereof and without disturbing said first casingmember or its connections with the circuit conduits, passages in saidsecond casing member and in said first casing member functioning whensaid members are assembled to complete communication between said pumpdevice and said ports, a shaft journaled in the bearing in said firstcasing member projecting at one end outwardly through and beyond saidannular boss and projecting at the other end into said pump device andhaving a driving connection therewith disengageable by movement of saidpump device axially of said shaft as an incident to removal of saidsecond casing member, a motor for driving said pump device having ashaft constructed drivingly to be coupled with said first mentionedshaft by relative axial movement of the shafts toward one another, acasing for said motor including an end bell providing a bearing for saidmotor shaft and having a recess for the reception of the annular boss onsaid first casing member to permit assembly or disassembly of said motorand said pump housing without disturbing said first casing member or itsconnections with the external conduits.

GUNNAR A. WAHLMARK.

